docs: def set_pubsubhubbub(self):
          """Parses pubsubhubbub and email then sets value"""
          self.pubsubhubbub = None
          atom_links = self.soup.findAll('atom:link')
          for atom_link in atom_links:
              rel = atom_link.get('rel')
              if rel == "hub":
                  self.pubsubhubbub = atom_link.get('href')